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A306668 as a simple table

na(n)
00
1-1
21
30
43
54
620
750
8189
9588
102100
117116
1225344
1389298
14321178
151156298
164206059
1715356796
1856424836
19208137800
20771229684
212867771004
2210700980956
2340050890172
24150328400292
25565699287186
262133889856550
278067040670100
2830559571239890
29115986196679730

[0,-1,1,0,3,4,20,50,189,588,2100,7116,25344,89298,
 321178,1156298,4206059,15356796,56424836,
 208137800,771229684,2867771004,10700980956,
 40050890172,150328400292,565699287186,
 2133889856550,8067040670100,30559571239890,
 115986196679730]